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(No Model.)

R. R. ZELL.

ARGH'FOR FURNACE DOORS.

No, 322,883, Patented July 21, 1885.

N. PETERS, Phnwumo n m, wmin mn. n. c.

UNITED STATES PATENT OFFICE.

ROBERT E. ZELL, OF NEWV YORK, N. Y., ASSIGNOR TO THE SAFETY STEAMGENERATOR COMPANY, OF SAME PLACE.

ARCH FOR FURNACE-DOORS.

SPECIFICATION forming part of Letters Patent No. 322,883, dated July21,1885.

Application filed April 20, 1885. (No model.)

To all whom it may concern:

Be it known that I, ROBERT E. ZELL, a citizen of the United States, andaresident of New York, in the county of New York and State of New York,have invented certain new and useful Improvements in Arches for Furnace-Doors; and I do hereby declare that the following is a full, clear, andexact description of the invention, which will enable others skilled inthe art to which it appertains to make and use the same, reference beinghad to the accompanying drawings, which form a part of thisspecification, and in which- Figure 1 is a front view of my improvedarch-box for water-tube boilers, showing the same in position foroperation. Fig. 2 is a rear view of the same, and Fig. 8 is averticalsectional view taken on the line a; x in Figs. 1 and 2 of the drawings.

The same letters refer to the same parts in all the figures.

This invention relates to that class of steam-generators which are knownas watertube boilers, and it has for its object to provide an arch orcasting to be placed over the furnacedoor, which shall serve to supportthe front ends of the water-tubes, and which shall admit of the freeexpansion and contraction of the entire front of the boiler,independently of the brickwork.

The invention consists in the improved construction of the said arch orcasting, which will be hereinafter fully described, and particularlypointed out in the claims.

In the drawings hereto annexed, A A designatethe sides or furnace-walls,which are constructed with openings, in which are placed the castironT-plates B B, forming seats for the ends of the arch. The latter, whichis designated by letter 0, consists of a triangular box or casting,through which suitable braces, D, extend longitudinally, as shown. Theends of the said casting are pro vided with shoulders E E, adapted torest upon the seats B B, and having open ends, which will admit of thepassage of air through the entire length of the casting, for the purposeof keeping the latter cool. The front side of the box or arch O isstraight and vertical, as will be seen at F, and is in a line with thefront of the furnace, directly above the door G. The top H of the archis slightly inclined in a downward and rearward direction, to correspondwith the inclination of the water-tubes I, the front ends of which areshown in the drawings, Fig. 3. The top of the arch is provided withtransverse ribs J J serving to support a pair of rollers, K K, on whichthe headers K of the water-tubes are supported. The back L of the archis inclined, as shown, so as to serve to deflect the flame and productsof combustion onto the water-tubes and away from the headers. The saidback is provided with T-shaped ribs M M, for the attachment offire-brick N when desired.

The operation and advantages of this invention will be readilyunderstood from the foregoing description, taken in connection with thedrawings hereto annexed. The front part of the boiler being supportedupon the rollers, as shown, expansion and contraction may take place tothe utmost extent.

Having thus described my invention, I claim and desire to secure byLetters Patent of the United States- 1. In a sectional boiler, anarch-box having an inclined top provided with transverse ribs, rollersplaced loosely on said top and resting against the said ribs, and theboiler-front supported on said rollers, all combined and arrangedsubstantially as set forth.

2. In a sectional boiler, the herein described triangular arch-box,having upper inclined side adapted to support the boiler front, andprovided with transverse ribs and inclined rear side forming adeflector, substantially as and for the purpose set forth.

3. In a sectional boiler, the herein described triangular arch-box,having inclined rear side provided with transverse T-ribs, incombination with the fire-brick attached to the said ribs, substantiallyas and for the purpose set forth.

4. In a sectional boiler, a triangular archbox having interior braces,and provided at the ends with extensions or shoulders having I Intestimony that I claim the foregoing as 10 open ends, substantially asand for the purmy own I have hereunto affixed my signature pose setfofth. in presence of two witnesses.

5. The combination, with the furnace-walls,

5 of the T-shaped plates or castings forming ROBERT R. ZELL.

s :ats in the same, and the triangulararoh-box having open-endedshoulders or extensions Witnesses:

adapted to rest on the said seats, substantially JACOB DURYEE,

as and for the purpose set forth. I JOHN J. RATHER.

